EBW-NVNonvacuum Electron Beam Welding
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As such, the overall EBW-NV column structure where the EB gun is located consists of a series of individually pumped vacuum stages, each connected to the other with a set of concentrically mounted apertures, i.e.
The EBW-NV process proved to be more adaptable to the type of large variations in joint condition (e.g., joint gapping, mismatch between edges, and poor edge quality) that production flange joints tend to display.
Before selecting the EBW-NV process for aluminum dashboard beams, extensive weld development tests were conducted on both coupons simulating actual part joint geometry and on prototype production parts.